The account that is used to start the Oracle Service must be given the "Lock Pages in Memory" right. You can do this by a) going to Administrative Tools, from the Start menu or Control Panel, b) opening Local Security Policy, c) opening Local Policies, then d) opening User Rights Assignment; e) open/edit the "Lock Pages in Memory" key, f) then add the Oracle Service account to this list.

Create an AWE_WINDOW_MEMORY String (REG_SZ) registry key in the Windows' Registry, under HKLM\Software\Oracle\h, where h is the ORACLE_HOME you're targeting. Set this value to the following calculated value (you can calculate this value via the calculator below):